共查询到20条相似文献,搜索用时 343 毫秒
1.
2.
3.
4.
采用DSC方法研究添加陶瓷粉对聚丙烯结晶的影响 总被引:1,自引:0,他引:1
采用差示扫描量热分析法 (DSC)研究了在聚丙烯中添加陶瓷粉后的热性能。根据 DSC提供的有关热参数 ,可评价添加陶瓷粉后聚丙烯的非等温结晶能力 ,并对改性聚丙烯最终获得的性能进行了预测 相似文献
5.
6.
7.
为对静电纺聚丙烯纤维进行亲水改性,采用表面活性剂吐温20,通过熔融微螺杆挤出机对等规聚丙烯进行熔融共混亲水改性,并通过静电纺丝的方法制备了聚丙烯纤维。通过傅里叶变换红外光谱分析、X射线光电子能谱分析和静态接触角测试对表面活性剂改性聚丙烯纤维的表面化学性质进行了表征,并使用差示扫描量热法对静电纺聚丙烯纤维进行了热力学性能测试。红外图谱显示表面活性剂吐温20已与聚丙烯共混成功,且改性后的聚丙烯纤维在表面活性剂吐温20添加量达到3%之后,静态水接触角明显降低,添加量达到5%时,接触角瞬间为零,展现出极好的吸湿性。X射线光电子能谱分析结果表明,表面活性剂吐温20富集在聚丙烯纤维的表面。 相似文献
8.
通过对聚丙烯纤维进行包覆处理,增加其表面的亲水性,并提高其密度;采用在植物纤维中配抄聚丙烯纤维作手抄纸性能对比实验;从宏观现象和实验分析得出:改性后的聚丙烯纤维分散性得到了提高。 相似文献
9.
10.
聚丙烯非织造布的晶型和结晶度对温度变化敏感,材料的各项性能与其密切相关。在不同温度下对聚丙烯熔喷非织造布进行热处理,并进行电晕放电驻极,对热处理后聚丙烯熔喷非织造布的结晶结构和性能进行研究。结果表明:随着热处理温度的升高,聚丙烯熔喷非织造布的晶型由拟六方晶型逐渐向α晶型转变,结晶度和晶粒尺寸也随之增大;热处理温度对聚丙烯熔喷非织造布的强力及伸长率、透气性、表面静电势和过滤性能均有较大影响;110℃下热处理的聚丙烯熔喷非织造布的驻极性能和过滤效能最好。 相似文献
11.
12.
本技术是采用负压式灌装原理,将液体先一次灌装到标准容器内,这是事先调整好的计量容量,然后再灌装到所装容器内,这样大大提高了计量的精度,解决了玻璃瓶或者其他容器大小不一的矛盾。由于采用了两次灌装,对于瓶的形状、直径大小、壁厚、高低没有多大的限制,因此,在同一台机器中可同时使用不同规格的瓶子,还可广泛适用于不透明的容器,如瓷瓶,铝制瓶和塑料瓶的液体灌装。 相似文献
13.
现代纺纱设备高效工艺的实践与探索 总被引:21,自引:11,他引:10
现代纺纱设备的技术进步使其主要工艺效能比传统纺纱设备有了很大的提升,使在现代纺纱设备上探索和实践高效率、高效益的纺纱工艺成为可能,高效纺纱工艺的应用可以大幅提高设备产能,显著降低纺纱生产的投资和运行成本.文中示例的实践和探索可以为选配和使用现代纺纱设备的企业提供参考. 相似文献
14.
15.
Margarita Naish Michael N Clifford Gordon G Birch 《Journal of the science of food and agriculture》1993,61(1):57-64
The astringency of 5-0-caffeoylquinic acid (5-CQA) was investigated by a time-intensity technique alongside those of tannic acid and grape-seed tannin. Significant differences were recorded between 5-CQA and the other phenolic solutions for the intensity of the response, its persistence (or overall duration), its fading (or decline from maximum intensity to zero), and for the total gustatory response (or total area under the time-intensity curve). In each case, 5-CQA elicited a weaker response than either grape-seed tannin or tannic acid. Nevertheless, overall, panellists recorded a response for 5-CQA that was qualitatively similar to those for tannic acid and grape-seed tannin, which are traditionally accepted as astringents. This phenomenon occurred, despite 5-CQA having a molecular mass of 354 and containing only one 1,2-dihydroxyphenyl residue, which would place it outwith the traditional definition of an astringent. The requirements appropriate to vegetable tanning may not therefore apply to oral astringency. 相似文献
16.
Fundamentals of stability testing 总被引:1,自引:0,他引:1
JOHN S. CANNELL 《International journal of cosmetic science》1985,7(6):291-303
The principles on which stability tests are based are reviewed. The need to differentiate between product stability and product-container compatibility is emphasized. Recognition of this distinction is fundamental to the efficient organisation and execution of stability tests.
Attention is also drawn to the desirability of having for every product a release specification with which it must comply when manufactured and a broader check specification with which it must comply throughout its shelf-life.
Test methods and the interpretation of the data accrued throughout a test are also discussed.
It is concluded that stability tests should not be conducted in accordance with a standardized routine pattern but that the objectives of each test should be defined and the test designed to achieve those objectives in the most efficient way.
Les regles fondamentales des essais de stabilite 相似文献
Attention is also drawn to the desirability of having for every product a release specification with which it must comply when manufactured and a broader check specification with which it must comply throughout its shelf-life.
Test methods and the interpretation of the data accrued throughout a test are also discussed.
It is concluded that stability tests should not be conducted in accordance with a standardized routine pattern but that the objectives of each test should be defined and the test designed to achieve those objectives in the most efficient way.
Les regles fondamentales des essais de stabilite 相似文献
17.
本文通过诸多设计案例展示"设计"在表现形式、工程学,以及人与物间的交流等方面的探索,并指出设计史研究中的局限性。作者将这些局限当成是一种激励,以促进读者思考造成这些局限的原因,寻找克服的方法以推动设计史研究的进步。文章将史学的视角带入设计的研究,提供设计发展背后的经济、政治和社会文本,向读者展示一个拓展的设计世界。 相似文献
18.
印刷机规矩测试信号分析 总被引:1,自引:1,他引:0
为了了解印刷机规矩的动态特性,建立了规矩实验装置。通过对前规、侧规及前规矩板的加速度信号和整机噪声信号分析得知,前规、侧规及规矩板的振动对机器噪声的贡献很小,但会影响到其工作的稳定性和工作寿命。通过对测试信号曲线分析发现,规矩部件对150-300Hz的激励信号的响应比对其他频率信号高3-10倍。 相似文献
19.
以北部湾地区水产冷库及其冷冻冷藏技术为研究对象,客观地分析其"建筑形式和规模"、"冷冻冷藏技术"、"制冷设备及系统"和"冷链物流功能"四个方面的发展现状,并由此从"整合冷库资源"、"开展水产品深加工"、"扩宽冷冻冷藏的‘温度带’"、"冷库及冷冻冷藏设施的现代化建设"及"加强水产品安全及环境保护"五个方面探索了其未来可能的发展趋势。最后表明,正确认识这一发展现状,把握未来发展趋势,对于加快北部湾地区水产品冷冻冷藏技术的现代化进程,促进区域经济发展,提高市场竞争力具有十分重要的意义。 相似文献
20.
Michael Yonan 《Textile》2016,14(3):376-393
This article unpacks the historical meanings of an important lace dress, one made for Empress Maria Theresa of Austria (1717–1780) and represented in two prominent paintings by her court portraitist Martin van Meytens. After examining the dress’s history and the circumstances of its production and reception, the article turns to the question of lace’s materiality, which it approaches through concepts derived from recent scholarship in material culture studies. This approach defines the dress less as a dazzling garment and more as a material product, as a thing with specific physical characteristics that interact with a range of conceptual ones. By examining how this dress was made and the implications of that making on its representation, the article seeks to enrich our interpretive results beyond what recent theories of fashion or identity alone would permit. Reaching those results requires thinking extensively about the making of lace, and indeed how lace’s materiality—its ontological status within the materiality of eighteenth-century society—can be theorized to generate meanings from it. The article then traces the lace’s post-garment history, locating at least three fragments that either repurpose parts of it or mimic the appearance of the original. 相似文献